amdgpu_pll_reduce_ratio(9)

💅 amdgpu_pll_reduce_ratio(9) — like, the Kernel API Manual page your bestie actually needed

okay so bestie, gather round 🎀 this one lives in the Kernel API Manual and it's a tiny little helper that does one specific glow-up job on fractions and then dips. no drama, no cap. let's get into it ✨

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✨ NAME ✨

amdgpu_pll_reduce_ratio — fractional number reduction 🧚

like, it takes a fraction and makes it snatched. that's the whole vibe.

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🌸 SYNOPSIS 🌸

void amdgpu_pll_reduce_ratio (unsigned *nom , unsigned *den , unsigned
nom_min , unsigned den_min );

that's it. that's the signature. she's short and she knows it 💅

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🦋 ARGUMENTS 🦋

• nom — the nominator 🫶 (yes, the manpage says "nominator", we're keeping it exactly like that, i don't make the rules)
• den — the denominator, her partner in crime
• nom_min — the minimum value the nominator is allowed to be, no going below bestie 🚫
• den_min — the minimum value the denominator is allowed to be, same energy, same floor

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🔥 DESCRIPTION 🔥

okay so here's what's happening under the hood, and it's honestly kind of iconic:

it finds the greatest common divisor and applies it to both the nominator and the denominator — like matching outfits, but math 🌈 — but it makes sure the nominator and denominator are at least as large as their minimum values.

so: reduce the ratio, yes, slay, but never let nom drop below nom_min and never let den drop below den_min. the floor is the floor, periodt 💀

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👑 SEE ALSO 👑

• the kernel file itself, living its best life at ./drivers/gpu/drm/amd/amdgpu/amdgpu_pll.c 📁
• amdgpu_pll_get_fb_ref_div(9)
• amdgpu_pll_compute(9)
• amdgpu_pll_get_use_mask(9)
• amdgpu_pll_get_shared_dp_ppll(9)
• amdgpu_pll_get_shared_nondp_ppll(9)

the whole friend group fr fr 🫶 go read them too, they're all in their lane and thriving.

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💖 reminder: every value here matters — nom, den, nom_min, den_min, all four, no skipping. the GCD does the work, the minimums keep it honest. iykyk ✨

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kisses, this page came to you from ./drivers/gpu/drm/amd/amdgpu, dated October 2026 — and the doc girlies said "make it cute," so here we are 🎀💜 bye bestie, go reduce some ratios responsibly ⭐